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/*
* Copyright (C) 2021 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#if !ENABLE(C_LOOP)
#include "RegisterSet.h"
namespace JSC {
class HashableRegisterSet : public RegisterSet {
enum State {
Normal,
Empty,
Deleted
};
public:
constexpr HashableRegisterSet() { }
template<typename... Regs>
constexpr explicit HashableRegisterSet(Regs... regs)
: RegisterSet(regs...)
{
}
enum EmptyValueTag { EmptyValue };
enum DeletedValueTag { DeletedValue };
HashableRegisterSet(EmptyValueTag)
: m_state(Empty)
{
}
HashableRegisterSet(DeletedValueTag)
: m_state(Deleted)
{
}
bool isEmptyValue() const
{
return m_state == Empty;
}
bool isDeletedValue() const
{
return m_state == Deleted;
}
private:
State m_state { Normal };
};
struct RegisterSetHash {
static unsigned hash(const HashableRegisterSet& set) { return set.hash(); }
static bool equal(const HashableRegisterSet& a, const HashableRegisterSet& b) { return a == b; }
static constexpr bool safeToCompareToEmptyOrDeleted = false;
};
} // namespace JSC
namespace WTF {
template<typename T> struct DefaultHash;
template<> struct DefaultHash<JSC::HashableRegisterSet> : JSC::RegisterSetHash { };
template<typename T> struct HashTraits;
template<> struct HashTraits<JSC::HashableRegisterSet> : public CustomHashTraits<JSC::HashableRegisterSet> { };
} // namespace WTF
#endif // !ENABLE(C_LOOP)
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